<!--
 * @Author: your name
 * @Date: 2021-04-27 14:56:22
 * @LastEditTime: 2021-04-27 15:32:21
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \js_study\demo03\src\index.html
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body style="padding: 50px;">
    <div class="calculator"></div>
</body>
</html>